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13 March 2016 : Case report  Japan

Successful Improvement of Metabolic Disorders, Including Osteopenia, by a Dopamine Agonist in a Male Patient with Macro-Prolactinoma

Unknown etiology, Unusual or unexpected effect of treatment, Unexpected drug reaction , Educational Purpose (only if useful for a systematic review or synthesis)

Ayumu TakenoABCDEF, Masahiro YamamotoABCDEF, Kyoko OkazakiABCD, Toru YamaguchiAB, Toshitsugu Sugimoto

DOI: 10.12659/AJCR.894712

Am J Case Rep 2016; 17:160-164

Abstract

BACKGROUND: Bone metabolic disorders in patients with prolactinoma have not been fully characterized. The case presented herein illustrates potential causal associations between prolactinoma and osteopenia, with a reversal of the disorder by treatment with a dopamine agonist.

CASE REPORT: A 43-year-old male with macro-prolactinoma [PRL 7770 ng/mL] was referred to our hospital. He suffered was overweight [body mass index (BMI) 29.4 kg/m2] and had impaired glucose tolerance, hypertriglyceridemia, and osteopenia. The patient was administered cabergoline, a dopamine D2 receptor agonist, and the dose was gradually increased up to 9 mg/week over the period of 1 year. One year later, the patient’s serum PRL levels decreased to within the normal range (19.1 ng/mL), and his pituitary tumor mass decreased to 1/4 of its initial size. His weight, dyslipidemia, and impaired glucose tolerance improved within 1 year. A marked increase in the bone mineral density (BMD) at the second to fourth lumbar spine (from 0.801 g/cm2 to 0.870 g/cm2, +8.6%) and at the femoral neck (from 0.785 g/cm2 to 0.864 g/cm2, +10.1%) were observed despite the presence of unresolved hypogonadism.

CONCLUSIONS: Treatments with dopamine agonists represent a beneficial strategy for patients with prolactinoma accompanied with bone loss, in addition to their established efficacy in shrinkage of the size of pituitary tumors, normalization of PRL levels, and improvement of metabolic disorders.

Keywords: Dopamine Agonists - therapeutic use, Bone Diseases, Metabolic - etiology, Ergolines - therapeutic use, Glucose Intolerance - etiology, Hypertriglyceridemia - etiology, Overweight - etiology, Pituitary Neoplasms - drug therapy, Prolactinoma - drug therapy

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923